DE2839746A1 - METHOD AND DEVICE FOR PRODUCING THE SOLUTION PREPARATION OF FINISHED JEWELERY LINK CHAINS (VENETIAN CHAINS) - Google Patents

Description

FICO Fischer & Co. Pforzheim, 08-09.1978

Mechanical engineering dmbH Be / gro

File Fi 6o

Method and device for the production of finished jewelry link chains for soldering preparation (Venetian chains)

The invention relates to a method 2 to manufacture Jewelry link chains (Venetian chains) according to the generic term of claim 1 and a device for performing * les method.

There are two general requirements for jewelry link chains: they must be aesthetically pleasing and at the same time durable. The aesthetic effect depends on the surface properties and the evenness of the chain links. For Venetian chains, this means that if the chain link is exactly rectangular, its visible surfaces must be completely flat. Since the human eye perceives further slightest variations in the arrangement of the chain association _f must also clear dimensions are strictly adhered to. Even slight deviations in the transverse play between interlocking chain links noticeably impair the aesthetic effect. The transverse play can subsequently be standardized within limits by means of an intensified beating process to which the chain is subjected. If, for example, due to insufficient tool quality, the longitudinal legs of the chain links are rounded over the longitudinal axis, the individual

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Chain link deviates from the exact rectangular shape, the flatness and parallelism of visible surfaces facing away from one another can be retrospectively reduced to a limited extent Achieve by a diamond process, which is compared to a common practice to achieve a desired surface gloss is aimed at a stronger material removal. Increased hammering and shape-correcting diamond coating disadvantageously increase the unit costs as additional measures. The shape-correcting diamond plating also leads - especially with precious metals - not only to a sensitive loss of material due to chip waste, but also to Weakening of the wire thickness of the respective chain link, which affects the durability of the chain in question will.

As already mentioned, exact production depends to a large extent on the nature of the tool. The Tools can cope with the possibly extremely small flat wire and chain link dimensions. They are usually very small and - even with high material quality - subject to heavy wear. As a result, they often have to be reworked and replaced. Disadvantageously, this not only results in high Tool costs, but also unavoidable downtime of the machine in question, with consideration of a required High unit costs cannot be justified in large-scale production to meet a high demand.

According to the prior art, a process for prefabricating the chain is followed by a process for converting the chain into a to bring the condition ready for soldering. The Venetian chain is first prefabricated on a first device and then to carry out a cyclical striking process for the predefinable setting of the minimum width of a butt joint gap for the soldering reception transferred to a second device between ends of the respective individual link to be connected to one another by soldering. The time and due to the requirement of two

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directions and local separation of the manufacturing process proves to be disadvantageous, as evidently, to be expensive.

The method for prefabricating the chain also has disadvantages. They are below in connection with a device explains what the applicant has to do with the status of Technology is expected.

A flat wire is drawn in horizontally up to a stop and cut to a specified length by lowering a cutting tool. A pre-bending tool with one of its outer edges is used as the cutting tool. It is releasably fastened in a tool holder, which can be moved up and down along a vertical guide axis transversely to the feed direction of the flat wire first bending mandrel bent to a ü. The first bending mandrel has a rectangular cross section. Its width corresponds to the sum of the lengths of the two axial legs and the first transverse web. As a result of the springback of the two U-legs, there is sufficient surface friction between the relevant surface areas of the flat wire section and the directly adjacent surfaces of the pre-bending tool. The U is therefore held in the pre-bending tool. The first bending mandrel is now axially extended transversely to the pull-in direction of the flat wire out of the effective area of the prebending tool, a second bending mandrel being released. The width of the second bending mandrel corresponds to the length of the first crossbar and consequently to one side of the rectangle to be circumscribed by the individual link. A finished bending tool for closing the U to the individual link is arranged above the pre- bending tool “ so that the second bending process (closing) is carried out by lowering the holder further. Here, the second bending mandrel is supported on an upper end of a holding tong ο The latter encloses two gripping elements with vertically arranged contact surfaces facing each other. These

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each have an upper end edge with a horizontal surface each forming the top end of the holding forceps in common »The gripping elements are from a basic position to the greatest of a lateral distance between the two Contact surfaces arranged pivotably. In the basic position corresponds to the distance between the contact surfaces at least the flacladraJhti width. If the holder is now responsible for the execution of the second bending process further lowered, then the two axial legs formed by turning at right angles in the transverse area of the ü, whose short legs are with. their free ends on a respective curved path approach each other up to the mutual butt joint. Enclosed the individual link closed in the manner described above now the second bending mandrel on its circumference in a by the basic position distance between the two contact surfaces limited area- (If several individual links are already prefabricated, then the chain section formed by them hangs with the last closed individual link on the second bending mandrel.) A vertical central axis of the holding forceps is in alignment with the guide axis of the tool holder. The holding forceps is now, for example clockwise, by 9o around the central axis from its supporting position for the second The bending mandrel is rotated and the latter is lowered to a predeterminable height between the contact surfaces. The gripping elements now take over the closed individual link by engaging with each other with their contact surfaces until frictional engagement with the Approach respective respective outer surface of the axial leg. The first crosspiece of the individual link is adjusted in one assembly level. The second bending mandrel is moved axially and is pulled out of the individual link. In order to the two short ü-legs of the next individual link - they each form one half of the second crossbar - in the Intervene height according to the adjusted individual link and reach the butt joint with both ends when closing can, the holding forceps is turned counterclockwise by 9o and is thus back in its support position

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for the second bending mandrel in the second bending process to finish bending (closing) the following individual link. The next flat wire can only be drawn in when the tool holder is in its starting position vertically upwards has returned to cutting to length.

In the case of the prefabrication process, it has been found to be disadvantageous that the respective process steps of cutting to length and pre-bending and closing at different heights of one extending around the vertical guide axis of the tool holder Play area. As a result, this area becomes for the duration of each individual member Process steps blocked. Another disadvantage is that The pre-bending tool also serves as a cutting tool for cutting the drawn-in flat wire and consequently raised it on one side Is subject to wear and tear. Because the closing tool is rigidly arranged directly above the pre-bending tool is, when pre-bending is not possible for the section area remaining between the two short U-legs Insert hold-down device. The flat wire can consequently slide around the two bending edges of the bending mandrel, so it remains disadvantageous not stretched horizontally, but rears up in an arch. This leaves the single part rounded in the relevant area. The unifying arrangement of the prebending and closing tool results in the individual parts have to be very thin, which is noticeable at a cost the bending stiffness and thus often leads to irregularities of the individual link or to tool breakage. Since the parts concerned have to be tough at low temperatures, they are often, especially on the cutting edge side of the pre-bending tool, individually handcrafted from band saw steel. This proves to be extremely time consuming and costly. Further is disadvantageous that the holding forceps must be rotated twice by 9o for each individual link, the gripping elements for their movement need to be controlled. According to the prior art, each method step is for controlling the drive or actuation of the individual components (intake device,

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Tool holders, bending mandrels, holding pliers etc.) on a control cam arranged a predetermined section. Usually, the control cam extends, closed in itself, along a Leading edge, for example circumference, of at least one disk driven for rotation. Not immediately by the requirement procedural idle steps, the process sequence is lengthened in time and additional equipment is required.

Finally, as already mentioned , it is disadvantageous that in order to achieve the state of the chain suitable for soldering preparation, a further process step for setting the gap width of the butt joint must be carried out on a second device. After closing, namely, the two axial legs of the individual link can spring back. As a result, the width of the butt joint gap cannot be adequately controlled, which is the case when soldering the. Chain can lead to scrap. In addition, the parallelism of the outer surfaces is not guaranteed. A springback of the two axial legs is to be expected to a disruptive extent, especially if the respective flat wire material is comparatively flexible. This is primarily the case with alloys with a low proportion of precious metals (e.g. gold). This difficulty occurs so conspicuously with solid wire, especially small dimensions, that up to now one had to resort to expensive solder wire, which required the use of expensive special solder for Venetian chains.

The invention is based on the object zuru avoiding the Described disadvantages a method for the preparation for soldering of finished Venetian chains in a single Process train and to provide a device for its implementation.

In terms of the method, this object is achieved by the invention specified in the characterizing part of claim 1.

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The advantages associated with the invention are already apparent obvious from the task. It is particularly worth mentioning that the respective process step of cutting to length, des Pre-bending and final bending (closing) in separate areas, each with its own tool is. The tool can only be used by a single one. Process step adapted, with greater wall thickness and consequently to be rigid and rigid in itself., The comparatively Larger possible wall thickness allows, for example, to further reduce wear and improve service life the use of hard metal. Advantageously, according to the invention, comparatively thick flat wires can also be used process exactly = The greater possible flat wire thickness results in a welcome, additional aesthetic one Effect. Further advantages will become apparent in the further course of the description. They also include, in particular, the possibility of Manufacture Venetian chains in the so-called Figaro manner, such as those used in anchor and curb chains is known. By analogy, this is understood to mean a Venetian chain in which a number that can be specified in each case identical individual links are followed by a single link with a comparatively greater length of the axial legs. Through this a special aesthetic effect can be achieved.

In the following, the invention will be largely explained using one of the details in the drawing, omitting details that are not essential to the invention schematically illustrated, preferred embodiment of the device explained in more detail,

It shows

1 shows a part of a Venetian chain consisting of two individual links in perspective Depiction,

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FIG. 2 shows an individual link according to FIG. 1 in a perspective illustration,

3 shows an embodiment of the device according to the invention in a simplified, schematic , perspective illustration,

4 shows a pre-bending device in side elevation and

5 shows a locking device in side elevation, in each case in the direction of arrow a in FIG. 1 seen and

6 shows a section of the device comprising parts of cross-nosed pliers and a striking device according to FIG. 3 in a plan view in a comparatively enlarged representation.

According to FIG. 1, individual links 1 and 2, which are bent at right angles from flat wire D, of a Venetian chain (not shown in detail) with a chain longitudinal axis 3 interlock vertically. The individual link 2 is designed according to FIG. It has two parallel, axial legs 4, 5 and a first 6 and a second transverse web 7. The second transverse web 7 consists of two halves 7a, 7b which, with their free ends 7a ¹ , 7b ¹ , form a butt joint with a gap 8 in the center of the web. The latter is used for soldering prior to a soldering process in which the two free ends 7a ¹ and 7b ¹ are connected to one another. In the transition between the two individual links 1 and 2, one of four throat areas 11 of a length corresponding to two flat wire thicknesses 12 can be seen, which are grouped with interruptions along the longitudinal axis 3 of the chain.

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According to FIG. 3, a simplified embodiment of the device according to the invention has, along an axis A, a transport device T, a cutting device L, in the area of the latter a feed device E, which is only hinted at, an essentially stationary hold-down device N, a pre-bending device V, and a closing device S. _r a cross-nosed pliers K and a striking device H on. A transport plane Te extends from the area of the cutting device L to the closing device S. The transport device T has a transport slide T 1 with a tongue T 2, which is arranged on the upper side of the transport plane Te for back and forth movement. The length-cutting device L consists of a fixed lower LI, a lowerable and liftable upper knife L 2 and a stop L 3. The upper blade L 2 is such block shaped _r that it comprises a respective flat wire portion 14 is covered on its entire length 15, and thus at the same time as Downholder becomes effective * The downholder N extends from the cutting device L to the pre-bending device V and delimits a transport path Ts for the tongue T 2 and a respective flat wire section 14. The pre-bending device V consists of an upper pre-bending tool V 1 for vertical lowering and lifting, a in the latter vertically lowerable and liftable hold-down device V 2 and a pre-bending mandrel V 3 “The pre-bending mandrel V 3 has a U-shaped cross-section (FIG. 4) with a first V 3.1 and a second leg V 3.2, a horizontal surface V 3.3 and between this and a respective flank V 3.5 and V 3.6 have a respective bending edge V 3.4. "It serves as a guide for an axially movable locking mandrel S 3. An underside contour of the upper bending tool V 1 has two bending flanks V 1.1, V 1.2 facing each other at an approximate distance of two leg lengths 13 plus an outer chain dimension 1o and two wire thicknesses 12 with a respective underside edge radius r On the upper side, the bending flanks V 1.1 and V 1.2 are connected to one another by an end face V of the hold-down device V 2. The upper pre-bending tool V 1 also has a vertical axial guide, not shown in detail, for a shaft V 2.2 of the hold-down device V 2 on.

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The locking device S adjoins the pre-bending device V to the right. It consists of a vertically lowerable and liftable upper closing tool S 1 with a hold-down device S 2, which can also be lowered and raised. The width of an end face S 2.1 of the hold-down device S 2 corresponds approximately to the outer chain dimension 1o. An underside contour of the upper closing tool S 1 has two vertical clamping flanks S 1.1, S 1.2 facing each other at an approximate distance between two leg lengths 13 plus an outer chain dimension 1o and two wire thicknesses 12, which merge into a respective horizontal clamping surface S 1.3, S 1.4. The latter extend towards the center and each merge at a predetermined radius r ₂ into two perpendicular closing flanks S 1.5, S 1.6 facing each other at a distance of the outer chain dimension 1o plus two flat wire thicknesses 12. An upper-side horizontal connection of the closing flanks S 1.5 and S 1.6 with one another is formed by an underside end face S 2.1 of the hold-down device S 2. The bottom closure of the upper closing tool S 1 is formed by horizontal immersion surfaces S 1.7, S 1.8 adjoining the clamping flanks S and S 1.2.

In the closed position, the locking pin S 3 is in the underside with a free end S 3.5 opposite end faces V 3.8, V 3.7 The contour of the upper closing tool S 1 can be moved.

The cross-nosed pliers K (see also FIG. 6) is arranged to be rotatable about a vertical, central axis Kd. She shows in one central area each aligned against the central axis Kd contact surface prisms K 1.5 four gripping elements K 1.1, K 1.2, K 1.3 and K 1.4. The contact surface prisms K 1.5, arranged on a circle KK, form an outer boundary a discharge section F, the vertical axis of which coincides with the central axis of rotation Kd and which

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horizontal axis Ä qtiert. The gripping elements K 1.1 ... KU are each arranged so that they can be elastically deflected against a centrally directed restoring force KP. 6 of the four gripping elements K 1.1. . · ■> K 1 .4 with mutually facing boundaries K 2.5 and K 2.6 each enclosing a right angle. Two immersion gaps K 2.7, K 2.8 between the aforementioned boundaries cross each other at 9o. below the plane Ke extend parallel to the axis A two striking bars H 1 and H 2 of the striking device H ^ to fins H 1.2, H 2.2 designed, vertical end faces of the striking bars H 1, H 2 face each other at a distance and each against the discharge path F. directed ,, The two striking bars H 1, H2 are arranged with their fins H 1.2, H 2 "2 towards and away from one another so that they can move. The movement takes place via a known and not shown deflecting drive. A minimum distance Ha between the two fins H 1.2, H 2 = 2 can be adjusted to a respective outer chain dimension 1o,

A flat wire D of width 9 and thickness 12 is drawn in in the direction of an arrow e transversely to a _{stroke direction t 1 of} the transport slide T 1 by means of the feed device E up to the stop L 3 and overflows a cutting edge L 1.1 of the fixed undercut knife L 1. The The upper knife L 2, designed as a cutting block, is lowered in the direction of an arrow L. As a result, a first flat wire section 14 ″ 1 of a predetermined length 15 is cut to length and then raised again in the direction of an arrow 1 ″. The transport slide T 1 executes a stroke TL in the direction of the arrow t., (Stroke direction). As a result, the first flat wire section 14.1 is pushed through by the tongue T 2 along the transport path Ts under the hold-down device W, which is arranged adjustable in height approximately at the distance of the flat wire thickness 12 above the transport plane Te. These processes are repeated in cycles, the first flat wire section 14.1 coming to rest in the area of the pre-bending device V on the pre-bending mandrel V 3. The corresponding in the upper pre-bending tool V 1 in the direction

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the arrows ^v ο 1 ' ^v 2 2 ^sen ^ ~ ^{un (} ^ liftable hold-down device V 2 is lowered and presses the first flat wire section 14.1 with a central part firmly against its base formed by the surface V 3.3 of the pre-bending mandrel V 3 2 is followed immediately by lowering the upper pre-bending tool V 1. As a result, two short legs 7a, 7b are bent at right angles on the first flat wire section 14.1, so that a flat U is formed. The upper pre-bending tool V 1 is _{raised again in the direction of an arrow V 12} , during the Hold-down V 2 still loosely holds the U bent from the flat wire section 14.1. It is transported further from the subsequent flat wire section 14.2 by a distance corresponding to the flat wire width 9 into the contour of the locking device S on the underside assigned and in the direction of an arrow S ₃₁ extended locking pin S 3, which with its unspecified underside is based on an upper surface H 1.1 (in the plane He) of the striking bar H1 ah. The outer surfaces of the short U-legs 7a, 7b come into contact with the clamping flanks S 1.1 and S 1.2 and are held by them. A hold-down device S 2 that can be lowered and raised in the upper closing tool S 1 in the direction of the corresponding arrows s ~ _{1 r} s _o ,, is lowered and presses the U firmly against a base formed by the surface S 3.1 in an area corresponding to the first transverse web 6. The lowering movement of the hold-down device S 2 is immediately followed by a lowering of the upper closing tool S 1, which reaches the immersion gap K 2.7 with its immersion surfaces S 1.7 and S 1.8 on the underside. As a result, the two axial legs 4 and 5 are bent at right angles, the two short U-legs 7a and 7b forming the second transverse web 7 ^{with the butt joint of their free ends 7a 1} , 7b ^1. The individual member 1 is closed and encompasses the cross section of the locking pin S 3. As a result of a spring-back force, the axial legs 4 and 5 remain in contact with the locking flanks S 1.5 via their outer surfaces 4 'and 5',

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S 1.6 in frictional engagement. The individual link 1 must now be positioned for the assembly of the subsequent individual link 2. For this purpose, the locking pin S 3 is first moved in the direction of an arrow S ₃₃ . The re-holder S 2 is in the direction of the arrow s,. lowered by a further predetermined distance and thereby stuffs the individual link 1, releasing the frictional engagement of the outer surfaces 4 ° and 5 ¹ with the closing edges S 1.5 and S 1 = 6 in the 2 \ bounded by the gripping elements K 1.1 <, "K 1.4" Conveyor line F. The gripping elements K 1 = 1. "" K 1 "4 are adjusted in such a way that, due to their elastic resilience, they grant the individual link 1 sufficient frictional engagement over the wire width 9, the first transverse web 6 being fixed in an assembly plane Fe (see FIG. 5) after the tamping movement. The upper closing tool S 1 and the hold-down device (tamper) S are in the direction of the arrows s. ~ _r s ~ ~ is raised and the cross-nosed pliers K is rotated 9o around its central axis Kd in the direction of an arrow kw ~. The individual member 1 is now in the assembly position for the following individual member 2, with the respective surface normals η * ,, η, of the outer surfaces 4 'and 5' of both the axis A and the surface normals of the fins H 1 = 2 and H 2.2 directed parallel are. The striking bars H 1 and H 2 are moved towards _{each other along direction arrows H 1 1} , h _{0 1 in} such a way that the fins H 1.2 and H 2.2 hit the outer surface 4% 5 "facing them of the gap 8 between the free ends 7a 'and 7b' The striking bars H 1 and H 2 remain in their position with the minimum distance Ha between their two fins H 1.2 and H 2.2 and fix the individual link 1 rigidly in the exact assembly position for the following individual link 2, In the meantime, according to the description in connection with the individual link, the following individual link 2 has been closed, with its halves 7a and 7b of the second transverse web 7 reaching under the first transverse web 6 of the single link 1 when reaching around the cross section of the locking pin S 3 the immersion surfaces S 1.7, S 1.8 reach the immersion gap K 2.8.

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bars H 1 and H 2 are brought back into the starting position _{in the direction of arrows S 12} S _22. The closed individual link 2 is now stuffed into the outfeed section F and, by rotating the cross-nosed pliers K in the direction of the arrow kw - is positioned and beaten by 9o for the assembly of the following individual link with an odd number. This process is repeated, with a resulting chain section being aligned with the chain longitudinal axis 3 coaxially with the axis Kd by the engagement of the contact surface prisms K 1.5 in the respective throat areas 11 and being moved along the discharge path F in the closing cycle. The conveyed chain is ready for soldering preparation. The soldering preparation takes place in a known manner and therefore does not need to be described here.

From the above description it can be seen that in each case several flat wire sections 14.1 ... 14.η are essentially simultaneously _{subjected to the successive process steps of cutting to length, pre-bending, closing r} striking and conveying out. This results in a greatly increased output compared with the prior art described, advantageously making it unnecessary to transfer the chain to a separate device for striking.

Furthermore, since the process sequence according to the invention does not have any empty steps, a drive-side Control effort can be kept comparatively small. The latter extends, among other things, as in the Introduction mentioned, on rotating cams for the coordinated actuation of the combined in the device Facilities. The drive part is not considered essential to the invention and therefore relies on its description and Representation omitted.

The respective devices are both individually and - to adapt the device to the production with different Flat wire and / or chain dimensions - set-

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arranged so that they can be easily replaced.

For the production of Venetian chains according to the Figaro manner mentioned in the introduction, one of the previously described ones is analogous working additional device to be provided, whereby in Assembly area results in a link with a resulting modified outfeed route.

Finally, the possibility should be emphasized instead of or to process in addition to flat wire sections = they differ from the former by one in each case Edge area, for example before drawing in, to predeterminable Way to achieve a special aesthetic effect performed trimming. This possibility arises with consideration to a greater deformation sensitivity of the boards compared to flat wire, advantageously from the presence of a respective hold-down device in the upper pre-bending and upper closing tool according to the invention and is related does not exist with the prior art described at the beginning. A related Venetian chain can only consist of individual links bent from plates. But it is also possible, both from flat wire sections like individual links bent from blanks in a predeterminable alternating number and sequence for a respective one To connect jewelry link chain with each other "

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Claims (9)

Claims Process for the production of finishedx jewelry link chains for soldering preparation with individual links bent at right angles from flat wire, each with two axial links Legs and a first and a second crossbar (Venetian chains), in the course of which the flat wire e.1. Is drawn, cut to length, a flat wire section pre-bent to a flat »U with two short legs, which transports the U and then bent (closed) into a single link in such a way / · - that the two short legs are under » Butt joint between the two free ends of the second transverse web form, the individual link according to the height - with the first transverse web in a predetermined assembly level - set up, releasably fixed and positioned for the assembly of the following individual link - now in the chain structure - along conveyed out a discharge line and the chain for the predefinable setting of a minimum width of a gap Solder pickup between the free ends is struck (hammered), characterized by the following Procedure modification: a) the cutting to length is followed by a transport step transversely to a feed direction, b) both transport steps are carried out transversely to a respective effective direction during cutting to length, pre-bending and final bending (closing) _e c) the flat wire section is used for pre-bending and for Hold down 030013/011? d) the respective closed individual link is used to set up the first transverse web in the assembly plane in the Challenger route stuffed and e) the beating is superimposed on the conveying out of the chain. 2. Device for performing the method according to claim 1, characterized by the following feature a) the respective device for cutting to length (L) _r transporting (T), pre-bending (V), closing (S), detachable fixing) ;! (K) and hitting (H) are separated from each other, _r arranged along a horizontal axis (A) b) a respective effective direction of the transport device (T) and the impact device (H) runs parallel to the Axis (A), c) a transport plane (Te) extends parallel to the axis (A), d) it encloses the cutting device (L), an upper knife (L 2) and a lower knife (L 1), the pre-bending device (V) an upper bending tool (V 1) _r a hold-down device (V 2} and a lower pre-bending mandrel (V 3) and the locking device (S) an upper closing tool (S 1), a hold-down device (S 2) and a lower locking mandrel ( S3), e) the lower parts (L 1, V 3, S 3) are each fixed in height, f) the upper parts (L 2, Vl, V2, S1, S2) are and movably arranged, g) the locking pin (S 3) is movable in the direction of its longitudinal axis parallel to the axis (A), h) a device for setting up the respective closed individual member (1, 2) in terms of height, called a tamper (S 2) , is assigned to the upper closing tool (S 1), © 30013/011? i) the means for releasable fixing is as a Longitudinal axis (Kd) rotatable cross-nosed pliers (K) formed, j) the cross-tongs (K) has four gripping elements (K 1.1, K 1.2, K 1.3, K 1.4) each with a contact surface prism (K 1.5), k) the gripping elements (K 1.1, K 1.2, K 1.3 _P K 1.4) are each arranged on a circular arc (KK) and can be deflected against a restoring force (KP) directed inwards towards the longitudinal axis (Kd) and delimit them with their contact surface prisms (K 1.5) an upper part of a discharge line (F) and 1) the outfeed section (F) crosses the axis (A). 3. Device according to claim 2, gekennzeichne t by the following features: a) vertically up and down along a respective longitudinal axis, the hold-down device (V 2) is in the Upper pre-bending tool (V 1) and the hold-down device (S 2) arranged in the upper closing tool (S 1) and b) the hold-down device (S 2) is also designed as a tamper. 4. Apparatus according to claim 2 or 3, characterized through the following features: a) the upper knife (L 2) is block-shaped in such a way that that it covers a respective flat wire section (14) over its entire length (15), b) the pre-bending mandrel (V 3) of the pre-bending device (V) is designed as an axial guide for the locking mandrel (S 3), 030013/01 17 c) the locking pin (S 3) of the locking device (S) is arranged in such a way that it is at one free end (S 3.5) over an end face (V 3.7) of the pre-bending mandrel (V 3) to the working area of the upper clamping tool (S 1) can move in and out d) the cross-nosed pliers (K) is delimited on the top by a plane (Ke) which is defined by the end faces (K 1.6) of the gripping elements (K 1.1 «... K 1.4) is formed e) the end faces (K 1.6) are separated from one another by spaces, which are separated by gaps (K 2 "7, K 2.8) of a given width form a right-angled isometric cross, in the middle area of which the outfeed section (F) begins, f) two striking bars (H 1, H 2) of the striking device (H), which can move towards and from one another, are directed with their respective fin (H 1.2, H 2 "2) against the discharge path (F) and each have a surface (H 1.1, H 2.1) on _f which are at least in one area of the cross-nosed pliers (K) in one plane (He), g) the pre-bending mandrel (V 3) is supported alternately on two adjacent end faces (K 1.6) from and h) the bending mandrel (S 3) retracted into the working area of the upper clamping tool (S 1) is also supported its free end (S 3.5) on the level (He) of the impact device (H). 5. Apparatus according to claim 2, 3 or 4, characterized marked that the transport 0117 ■ ~ j "* ™ plane (Te) extends from the area of the cutting device (L) to the free end (V 3.9) of the pre-bending mandrel (V 3). 6. Device according to one of claims 2 to 5, characterized in that above the transport plane (Te) between the cutting device (L) and the Vorbiegeeiiirrichtung (V) a hold-down device (N) is arranged through which a along the axis {A) Transport route (Ts) is formed, 7. Device according to one of claims 2 to 6 _y, characterized in that the transport device (T) encloses a cyclically oscillating transport slide {T 1) with a tongue (T 2). 8. Apparatus according to claim 7, characterized in that that a stroke length (Th) of the transport slide (T 1) is adjustable and variable. 9. Device according to one of claims 4 to 8, characterized characterized, dciß an axial minimum distance (Ha) between the fins (H 1.2, H 2.2) of the Striking bar (H 1, H 2) is adjustable and changeable. 030013/0117